CN211734081U - Flue evaporation and collaborative SO removal for zero discharge of desulfurization wastewater3HCl/HCl device - Google Patents
Flue evaporation and collaborative SO removal for zero discharge of desulfurization wastewater3HCl/HCl device Download PDFInfo
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- CN211734081U CN211734081U CN202020070783.1U CN202020070783U CN211734081U CN 211734081 U CN211734081 U CN 211734081U CN 202020070783 U CN202020070783 U CN 202020070783U CN 211734081 U CN211734081 U CN 211734081U
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Abstract
The utility model relates to a zero release flue evaporation of desulfurization waste water and desorption SO in coordination3The HCl/hydrogen chloride (HCl) device comprises an SCR denitration reactor, an air preheater, a dust remover and a desulfurizing tower which are sequentially connected with a main flue, and further comprises a rotary atomizing drying tower, a triple box and a stirring towerMix pond, waste water elevator pump, high-order feed box, injection apparatus and salinity recovery processing system. The utility model discloses combine desulfurization waste water bypass spray drying evaporation and flue header evaporation process organic, can solve under the low boiler load and singly adopt the flue header evaporation technique to be difficult to the defect of handling desulfurization waste water completely to and reduce the influence of flue header evaporation technique to boiler thermal efficiency, and SO in the desorption flue gas in coordination3HCl, thereby reducing the generation amount of desulfurization waste water.
Description
Technical Field
The utility model relates to a coal fired unit desulfurization waste water zero release field especially relates to a desulfurization waste water zero release flue evaporation and desorption SO in coordination3HCl/HCl apparatus.
Background
Along with the improvement of the economic level of China, the industrial and domestic power consumption requirements are more and more, at present, thermal power generation is mainly used domestically, the coal consumption is increased, and the atmospheric pollution of China shows a tendency of accelerated deterioration. In order to reach the emission standard of atmospheric pollutants of thermal power plants (GB13223-2011), the limestone-gypsum method desulfurization process becomes the standard configuration of the coal-fired power plants. However, the process generates desulfurization waste water containing various impurities during operation.
The desulfurization wastewater treatment difficulty is higher due to the characteristics of strong corrosivity, high turbidity, excessive heavy metal content, high salt content, large water quality fluctuation and unstable water quantity. The action plan for preventing and treating water pollution (Ten items in water) is issued by state academy in 2015, and a coal-fired power plant generating desulfurization wastewater is provided with a desulfurization wastewater treatment system to ensure that the desulfurization wastewater reaches the standard and is discharged. So far, although a mature process chemical precipitation method can effectively remove metal ions, effluent still contains a large amount of chloride ions, and therefore, desulfurization wastewater zero-emission technologies, such as an evaporative crystallization technology, a flue evaporation technology, a rotary atomization drying technology and the like, are produced. The above methods have certain defects in desulfurization wastewater treatment, such as higher construction investment and operation cost of the traditional evaporative crystallization technology. The flue evaporation technology is that the waste water is sprayed into a flue between an air preheater and an electric dust remover, the waste water is completely evaporated by utilizing hot flue gas, pollutants in the waste water are converted into solid such as crystals or salts, and the like, but the flue distance between the air preheater and the electric dust remover is smaller due to low-temperature transformation, and the aim of complete evaporation can not be achieved if the desulfurization waste water is completely evaporated by a main flue; and the rotatory atomizing drying tower of desulfurization waste water is then to extract a strand of hot flue gas between SCR denitration reactor and the air preheater, carries out the waste water evaporation through rotatory atomizing drying tower, if desulfurization waste water is all evaporated by rotatory atomizing drying tower, then can cause too much load to the boiler.
SUMMERY OF THE UTILITY MODEL
Based on the problem, the utility model discloses rotatory atomizing spray drying device reforms transform to current desulfurization waste water, provides a desulfurization waste water zero release flue evaporation and desorption SO in coordination3HCl/HCl apparatus.
In order to achieve the purpose, the utility model discloses the concrete technical scheme who takes is:
flue evaporation and collaborative SO removal for zero discharge of desulfurization wastewater3HCl's device, including SCR denitration reactor, air heater, dust remover, the desulfurizing tower of being connected with the flue main in proper order, still include rotary atomization drying tower, three headers, stirring pond, waste water elevator pump, high-order feed box, injection apparatus and salinity recovery processing system, wherein:
one end of the rotary atomizing drying tower is communicated with a main flue between the SCR denitration reactor and the air preheater through a first bypass flue, and the other end of the rotary atomizing drying tower is communicated with the main flue between the air preheater and the dust remover through a second bypass flue; the salt recovery treatment system is connected with a discharge port at the bottom of the rotary atomization drying tower;
the inlet end of the triple box is connected with the desulfurizing tower, and the outlet end of the triple box is provided with a tee joint; the first port of the tee joint is connected with the outlet end of the triple header; a second port of the tee joint is connected with the high-level feeding box through the wastewater lifting pump, and the high-level feeding box is connected with the rotary atomization drying tower; and a third port of the tee joint is connected with the stirring tank, the stirring tank is connected with the injection device through the wastewater lifting pump, and the injection device is arranged in a main flue between the air preheater and the dust remover.
Further, the injection device is a two-fluid atomization nozzle.
Further, the rotary atomizing drying tower comprises: the drying tower comprises a drying tower main body, a rotary atomizer and a flue gas distributor; the rotary atomizer is connected with the high-position feeding box, and the flue gas distributor is connected with the first bypass flue.
Further, the distance at the interface of the injection device and the second bypass flue with the main flue is 1 to 2 meters and in a direction away from the air preheater.
Further, the device also comprises a flow regulating valve for regulating and controlling the discharge amount of the desulfurization waste water, and the flow regulating valve is arranged on the tee joint.
The utility model has the advantages that:
1. the utility model has the advantages of being simple in structure and convenient in operation, combine flue evaporation technique on the basis of original rotatory atomizing drying tower of desulfurization waste water, solved under the low-load single pure flue evaporation technique of adopting and be difficult to the defect of handling desulfurization waste water completely, effectively reduce the influence to boiler thermal efficiency.
2. Most of the desulfurization wastewater in the utility model is evaporated by using the rotary spray drying tower, and the heat of hot flue gas in front of the air preheater is used, so that no extra steam is needed, and the method is a low-energy-consumption technology; only a small amount of hot flue gas needs to be extracted, the influence on the original system of the boiler is small, and the purpose of recovering salt in the bottom slag of the drying tower is achieved.
3. The utility model discloses in partly desulfurization waste water add alkaline absorbent and absorb HCl and SO after the triplex case quenching and tempering3The alkaline desulfurization wastewater absorbs HCl and SO in the evaporation process3After reductionThe amount of formation in the desulfurization waste water in the wet desulfurization system.
Drawings
Fig. 1 is a schematic view of the process flow of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. SCR denitration reactor, 2, air heater, 3, rotatory spray drying tower, 4, dust remover, 5, desulfurizing tower, 6, the triplex case, 7, stirring pond, 8, waste water elevator pump, 9, high-order feed box, 10, injection apparatus, 11, salinity recovery processing system, 12, flue stack, 13, first bypass flue, 14, second bypass flue.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "center", "inner", "outer", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in figure 1, the utility model provides a flue evaporation and collaborative SO removal for zero discharge of desulfurization waste water3Method for producing HClThe device, including SCR denitration reactor 1, air heater 2, dust remover 4, the desulfurizing tower 5 that is connected with main flue 12 in proper order, its characterized in that: still include rotary atomization drying tower 3, triplex case 6, stirring pond 7, waste water elevator pump 8, high-order feed box 9, injection apparatus 10 and salinity recovery processing system 11, wherein:
one end of the rotary atomizing drying tower 3 is communicated with a main flue 12 between the SCR denitration reactor 1 and the air preheater 2 through a first bypass flue 13, and the other end of the rotary atomizing drying tower is communicated with the main flue 12 between the air preheater 2 and the dust remover 4 through a second bypass flue 14; the salinity recovery processing system 11 is connected with a discharge hole at the bottom of the rotary atomization drying tower 3;
the inlet end of the triple box 6 is connected with the desulfurizing tower 5, and the outlet end of the triple box 6 is provided with a tee joint; the first port of the tee joint is connected with the outlet end of the triple header 6; a second port of the tee joint is connected with the high-level feeding box 9 through the wastewater lifting pump 8, and the high-level feeding box 9 is connected with the rotary atomizing drying tower 3; the third port of the tee joint is connected with the stirring tank 7, the stirring tank 7 is connected with the injection device 10 through the wastewater lifting pump 8, and the injection device 10 is arranged in the main flue 12 between the air preheater 2 and the dust remover 4.
In a more preferred embodiment, the spray device 10 is a two-fluid atomizing nozzle.
In a more preferred embodiment, the rotary atomizing drying tower 3 comprises: the drying tower comprises a drying tower main body, a rotary atomizer and a flue gas distributor; the rotary atomizer is connected with the high-level feeding box 9, and the flue gas distributor is connected with the first bypass flue 13.
In a more preferred embodiment, the distance at the interface of the injection device 10 and the second bypass flue 14 with the main flue 12 is 1 to 2 meters, and in a direction away from the air preheater 2.
In a more preferable embodiment, the system further comprises a flow regulating valve for regulating the discharge amount of the desulfurization waste water, and the flow regulating valve is installed on the tee joint.
The utility model discloses work flow does:
firstly, adding lime slurry into desulfurization wastewater generated in a wet desulfurization process through the triple box 6 to adjust the desulfurization wastewater to be alkalescent, wherein the pH value of the adjusted desulfurization wastewater is 9-10;
secondly, at the outlet end of the triple box 6, a part of the tempered desulfurization wastewater is conveyed to the high-level feed box 9 through a second port of the tee joint by the wastewater lift pump 8, automatically flows into the rotary atomization drying tower 3, and fully contacts with hot flue gas extracted between the SCR denitration reactor 1 and the air preheater 2, the wastewater is rapidly evaporated to dryness, moisture is evaporated into the flue gas and is discharged into the main flue 12 through a second bypass flue 14, and most of the evaporated and separated inorganic salt falls into a discharge port at the bottom of the rotary atomization drying tower 3 and is conveyed to the salt recovery processing system 11;
then, the rest of the modified desulfurization wastewater enters the stirring pool 7 through a third port of the tee joint, an alkaline absorbent is added into the stirring pool, and then the modified desulfurization wastewater is conveyed to the two-fluid atomization nozzle through the wastewater lifting pump 8 and sprayed into the main flue 12 to be evaporated, wherein the alkaline absorbent and HCl and SO in the flue gas are evaporated in the wastewater evaporation process3Reaction and trapping are carried out, the reaction and trapping and the flue gas discharged by the second bypass flue 14 enter the dust remover 4 together, and inorganic salt fine particles evaporated and separated from the waste water are trapped by the dust remover 4.
The utility model discloses combine desulfurization waste water bypass spray drying evaporation and flue header evaporation process organic, can solve under the low boiler load and singly adopt the flue header evaporation technique to be difficult to the defect of handling desulfurization waste water completely to and reduce the influence of flue header evaporation technique to boiler thermal efficiency, and SO in the desorption flue gas in coordination3HCl, thereby reducing the generation amount of desulfurization waste water.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. Flue evaporation and collaborative SO removal for zero discharge of desulfurization wastewater3The HCl's of/device, including SCR denitration reactor (1), air heater (2), dust remover (4), desulfurizing tower (5) be connected with main flue (12) in proper order, its characterized in that: still include rotary atomization drying tower (3), triplex case (6), stirring pond (7), waste water elevator pump (8), high-order feed box (9), injection apparatus (10) and salinity recovery processing system (11), wherein:
one end of the rotary atomizing drying tower (3) is communicated with a main flue (12) between the SCR denitration reactor (1) and the air preheater (2) through a first bypass flue (13), and the other end of the rotary atomizing drying tower is communicated with the main flue (12) between the air preheater (2) and the dust remover (4) through a second bypass flue (14); the salt recovery treatment system (11) is connected with a discharge hole at the bottom of the rotary atomization drying tower (3);
the inlet end of the triple box (6) is connected with the desulfurizing tower (5), and the outlet end of the triple box (6) is provided with a tee joint; the first port of the tee joint is connected with the outlet end of the triple header (6); a second port of the tee joint is connected with the high-level feeding box (9) through the wastewater lifting pump (8), and the high-level feeding box (9) is connected with the rotary atomizing drying tower (3); the third port of the tee joint is connected with the stirring tank (7), the stirring tank (7) is connected with the injection device (10) through the wastewater lifting pump (8), and the injection device (10) is arranged in the main flue (12) between the air preheater (2) and the dust remover (4).
2. The desulfurization waste water zero-discharge flue evaporation and cooperative SO removal method according to claim 13HCl/HCl system, characterized in that: the spray device (10) is a two-fluid atomizing nozzle.
3. The desulfurization waste water zero-discharge flue evaporation and collaborative SO removal method according to any one of claims 1 and 23HCl/HCl system, characterized in that: the rotary atomizing drying tower (3) comprises: the drying tower comprises a drying tower main body, a rotary atomizer and a flue gas distributor; the rotary atomizer and the high-position feedThe material box (9) is connected, and the smoke distributor is connected with the first bypass flue (13).
4. The desulfurization waste water zero-discharge flue evaporation and cooperative SO removal method according to claim 13HCl/HCl system, characterized in that: the distance at the interface of the injection device (10) and the second bypass flue (14) with the main flue (12) is 1 to 2 meters and in a direction away from the air preheater (2).
5. The desulfurization waste water zero-discharge flue evaporation and cooperative SO removal method according to claim 13HCl/HCl system, characterized in that: the desulfurization waste water treatment device also comprises a flow regulating valve for regulating and controlling the discharge amount of desulfurization waste water, wherein the flow regulating valve is arranged on the tee joint.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020070783.1U CN211734081U (en) | 2020-01-14 | 2020-01-14 | Flue evaporation and collaborative SO removal for zero discharge of desulfurization wastewater3HCl/HCl device |
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| CN202020070783.1U CN211734081U (en) | 2020-01-14 | 2020-01-14 | Flue evaporation and collaborative SO removal for zero discharge of desulfurization wastewater3HCl/HCl device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112604496A (en) * | 2020-12-30 | 2021-04-06 | 广东电网有限责任公司电力科学研究院 | System for removing hydrogen chloride and sulfur trioxide in flue gas in coordination with desulfurization wastewater |
| CN112604497A (en) * | 2020-12-30 | 2021-04-06 | 广东电网有限责任公司电力科学研究院 | System for desulfurization waste water desorption flue gas fine particle and sulfur trioxide in coordination |
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2020
- 2020-01-14 CN CN202020070783.1U patent/CN211734081U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112604496A (en) * | 2020-12-30 | 2021-04-06 | 广东电网有限责任公司电力科学研究院 | System for removing hydrogen chloride and sulfur trioxide in flue gas in coordination with desulfurization wastewater |
| CN112604497A (en) * | 2020-12-30 | 2021-04-06 | 广东电网有限责任公司电力科学研究院 | System for desulfurization waste water desorption flue gas fine particle and sulfur trioxide in coordination |
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